326 Flat tyre When using new or newly-painted wheel rims, check the tightening torque again after trav- elling approximately 1000 to 5000 km. Tyre inflator connection After fitting the wheel: X Tighten the wheel nuts in a crosswise pat- tern. Observe the correct tightening torque ( Y page 357). X Vehicles with tyre pressure control sys- tem: push connector = into compressed- air connection : and hold until circlip ; engages. Breakdown assistance You may only fill the tyres using the compressed-air system if your vehicle has a tyre inflator connection. The reservoir pres- sure is too high for other connections. Pres- sure hoses and tyres may explode when filling using other connections.
X All vehicles: fit the wheel nut cover. X Vehicles without tyre pressure control system: check the tyre pressure ( Y page 340). X Vehicles with tyre pressure control sys- tem: activate the automatic mode of the tyre pressure control system ( Y page 186). X To inflate the tyres: remove cap on tyre inflator connection : . X Remove tyre inflator hose from the stow- age compartment in the rear of the cab ( Y page 312). X All vehicles: the wheel nuts must be retightened after 50 km ( Y page 326). X If the vehicle is predominantly used on prepared road surfaces: specified tyre pressures must be observed. X Deflate at tyre inflator connection : .
Retightening the wheel nuts G WARNING The wheels could work loose if the wheel nuts and bolts are not tightened to the specified tightening torque. There is a risk of accident. Have the tightening torque immediately checked at a qualified specialist workshop after a wheel is changed. X When driving off-road and on surfaces with minimal load-bearing capacity (e.g. sand): lower the tyre pressure ( Y page 352). This improves the traction of the tyres. i The self-cleaning effect of the tyres is improved at low tyre pressure, e.g. on greasy and wet surfaces. ! Check wheel nuts regularly for tightness. Retighten if necessary. Replace damaged wheel nut covers.
Observe the wheel nut tightening torques. Observe the wheel nut tightening torque ( Y page 357).